The cordon around the unexploded World War Two bomb in Plymouth is set to be expanded from 09:00 GMT on Thursday, police have confirmed.
The exclusion zone will widen from 200m (650ft) to 300m (985ft), Ch Supt Matt Longman said.
Police said those who had already been evacuated would be allowed to go home and collect any essentials until 09:00.
Mr Longman said people should be prepared to be away from their homes for 36 hours.
Ch Supt Longman said those who are going to be affected by the widening of the cordon would be notified.
He said people should “prepare as early as they can” to leave the area – and if they were not sure if they were affected by the expansion of the cordon, the police force would make sure the relevant information was available on the Plymouth City Council website.
Teams from Plymouth City Council and partner agencies will be in the area to knock on the doors of the properties affected by the extended cordon from 08:00 on Thursday.
The council is advising residents who have homes within the new cordon to take enough clothes and any medical prescriptions or equipment for the next couple of days.
The Life Centre will be open to accommodate people as well, the council said.
Lt Col Rob Swan, commanding officer of the 11 Explosive Ordnance Disposal & Search Regiment, confirmed the bomb was a “German air-drop munition from World War Two”.
He said experts were still working to understand the exact make-up of the bomb, and to decide the best course of action to take to make it safe.
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